Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany

Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany

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Hoppe C.,Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany | Ebbert C.,Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany | Voigt M.,Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany | Schmidt H.C.,Forming And Machining Technologyuniversitat Paderbornwarburger Str 10033098Paderborngermany | And 4 more authors.
Advanced Engineering Materials | Year: 2016

Interface modification based on ultra-thin mercapto-propyl(trimethoxy)silane (MPTMS) films is shown to promote joining of copper and aluminum by plastic deformation followed by a heat treatment. The surface morphology and the surface chemistry of the metal substrates were analyzed by means of FE-SEM, XPS, and FT-IRRAS. The spectroscopic data show that the MPTMS film is crosslinked via Si-O-Si bonds and that stable Cu-S and Si-O-Al interfacial bonds are formed. The shear-force tests of the joints led to force displacement curves that are characteristic for a covalently bonded interface. Complementary cross sectional SEM and EDS analysis of the joint proved that a defect-free interface was formed without any measureable interdiffusion of metals across the interface or cracking of an oxide films. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Hordych I.,Institute For Werkstoffkunde Materials Science Leibniz University Hannoveran Der University 230823Garbsengermany | Rodman D.,Institute For Werkstoffkunde Materials Science Leibniz University Hannoveran Der University 230823Garbsengermany | Nurnberger F.,Institute For Werkstoffkunde Materials Science Leibniz University Hannoveran Der University 230823Garbsengermany | Hoppe C.,Technical And Macromolecular Chemuniversitat Paderbornwarburger Str 10033098Paderborngermany | And 4 more authors.
Steel Research International | Year: 2016

In the present study, the improvement of the bond strength of galvanized steel sheets in the cold roll bonding process is investigated. Zn-Fe intermetallic compounds are employed as an intermediate layer. The galvanized low-carbon steel is cold roll bonded. Prior to the roll bonding, the sheets are heat treated in the temperature range from 450 to 550°C. The influence of the heat treatment on the bond strength is investigated. It is found that the use of the pre-rolling annealing increases the bond strength. The highest average value is observed after a treatment at temperatures in the range from 450 to 500°C. Higher temperatures, however, reduce the bond strength. The bond is analyzed by optical and scanning electron microscopy (SEM) and evaluated in a tensile shear test. The interaction between iron and zinc is considered to be responsible for the improved bond strength. The presence of intermetallic compounds in the interface zone forms a brittle layer, which is required to create juvenile surfaces due to local fracturing during the roll bonding. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

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